Getting the Size of an In-Memory Bitmap

I have an image compression utility and I want to let users know the size of the compressed image they're about to save.

How can I programmatically predict the file size of an in-memory bitmap without actually writing a file to disk? I'm using GDI+ of course.
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Save image to MemoryStream and get it's size.
I don't know what image compression utility do you use. I can guess that any .NET component which can write to file, can write also to stream.

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boulder_bumAuthor Commented:
That seems like a viable solution. Thanks!

The image compression utility is actually something I cooked up myself so I have full control over any tweaks.

I'll test when I get home and deal with the points or follow-up then.
boulder_bumAuthor Commented:
It worked!

Luckily I write to a MemoryStream in my utility, so I just had to get the length and expose the result as a property. Cheers!
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